Rock crushing device



INVENTDR: THOMAS SAN-D Y,

Br a... .Q. .1

ATTORNEY.

T. SANDY ROCK CRUSHING DEVICE Filed April 14, 1939 Oct. 21, 1941.

Patented Oct. 21, 1941 OFFICE ROCK CRUSHING DEVICE Thomas Sandy, Goderich, Ontario, Canada Application April 14, 1939, Serial No. 267,887 In CanadaFebruar-y 6, 1939 This invention relates to rock crushing devices and is adapted to crush rock, stone or other aggregate.

One of the objects of the present invention is to provide a device of this character wherein the movable elements are operated in a more efficient and economical manner.

Another object of the invention is to provide a device of this character wherein the toggle operating lever and associated parts are so constructed that friction and consequently lubrication are reduced to a minimum.

A further object of the invention is to provide a device of this character wherein the toggle operating levers and associated parts are operable on the lever principle thus insuring greater crushing pressure with less operating power.

A still further object of the present invention is to (provide a device of this character which readily lends itself to dismantling and reassembling for the removal, replacement or repair of parts as and when required.

Yet a further object of the present invention is to provide a device of this character which is durable in structure, rugged in nature and one that not only increases the life of the device but enables it to the more satisfactorily perform the functions required of it.

Having regard to the foregoing and other objects and advantages which will become apparent as the description proceeds, the invention consists essentially in the novel combination and arrangement of parts hereinafter described in detail and illustrated in the accompanying drawing in which:

Fig. 1 is a sectional elevation of a rock crushing device disclosing an embodiment of the present invention, and is taken on the line I--l of Fig. 2, and

Fig. 2 is a plan view of Fig. 1 shown partly broken away and partly in section and dotted lines for purposes of clarity.

In the accompanying drawing wherein like characters of reference designate corresponding parts in the illustrations, the numeral l5 indi cates a frame of any suitable type or structure and upon which the rock crushing elements are mounted.

Stationary crusher member [6 and movable crusher members I? and I8, each provided with suitable crusher plates, are mounted in the frame adjacent to one another. The movable crusher members it will be observed are arranged at an angle with reference to the stationary crusher member thus providing a hop-per like formation for the reception of uncrushed stone.

The crusher members I1 and [8 are movably supported upon a transverse shaft l9 which in turn is supported in suitable bearings in the frame [5. As more particularly illustrated in Fig. l, the members I1 and I8 depend from the shaft l9 and are alternately movable toward and from the stationary crusher l6 by a toggle lever arrangement for the crushing of rock, stone and the like as will be hereinafter explained.

Mounted adjacent. the movable crusher members and operable on the lever principle through cam means or the like are toggle'leyers 20 and 2|. Intermediate the toggle levers and the movable crusher members and adjacent the lower extremities thereof are toggle members 22 and i 23 which are preferably formed with rounded or curved. contacting edges.

Bearing surfaces for the toggle elements are provided for in both the movable crusher members and the toggle levers. In the movable crusher members such bearing surfaces take the form of hardened shims 24,which are convenient ly mounted in recesses 25 while the bearings for the toggle elements in the toggle levers takes the form of a hardened shim 26 preferably concave in formation for the reception of the toggle edge. The shims 26 in each case are detachably retained in position by means of bracket members or the like 21.

As more particularly exemplified in Fig. 1, the lower or pressure exerting ends of the toggle levers are recessed across their width and formed with substantially hook-like extremities which taper abruptly in V-like formation in a cross section to provide contacting edges 28. The edge 28 of the toggle levers, it will be observed, tapers sharply from a relatively large body to a relatively fine nose and grips and has a point bearing against the hardened and preferably concave shim members 29 which are mounted on a fixed, transversely extending bar member 30. The shims 29 conveniently are detachably retained in position by suitable means such as clamping members or the like 3|.

It will be observed that the hook-shaped end of each toggle lever is formed with a convex front face and a concaved rear face, the said faces being eccentrically curved and tapering rearwardly at acute angles relative to each other to provide a hook-shaped bearing end terminating in a rearwardly extending comparatively thin V- shaped transverse bearing nose and a recess overhanging the same. This nose pivotally engages the concaved face of the bearing shim in such manner that the portion of the bar and shim lying above the point of contact of the nose with the shim is adapted to be received and accommodated in the clearance recess formed by the concaved face of the hook-shaped bearing end as the toggle lever swings back and forth. In addition, the concave surface of the shim has an arc of greater radius than the are represented by the nose of the toggle levers, thus, the nose 28 is adapted to have free pivotal movement as well as up and down play in the concaved bearing face of the shim. This construction provides for a minimum amount of bearing contact between the shim and the bearing nose of the toggle lever with a consequent reduction of friction so that the necessity of lubricating these parts or points of contact is avoided. As the nose of the toggle is permitted to have up and down play or movement in the concaved surface of the shim the bearing edge of the nose also serve to constantly wipe the concaved shimsurface so as to loosen up and remove dust and other deposits with the result that the bearing surfaces will constantly be kept comparatively free from deposits causing excessive wear and friction thereon.

Adjacent the upper or lever ends of the toggle levers I provide roller members 32 and 33. These rollers are supported by shafts 3d and 35 which in turn are carried by brackets .36 which further in turn are connected to the toggle levers.

For operating the toggle levers I provide cam or eccentric members 31 and .38 which maintain rolling contact with the rollers 32 and 33. The cam members are rigidly mounted upon the transversely extending drive shaft 39, the shaft in turn being driven by drive pulley 40 from a suitable source of power. As illustrated,- the cam members are so arranged that they operate alternately and in turn operate the toggle levers and the movable crusher members alternately. Thus as one crusher member is advancing in a crushing movement, the other crusher member is moving retractively. 1

Pivotally secured adjacent the pressure exerting extremity'of the movable crusher members are tension rod members 4| and42. These rods extend rearwardly of the movable crusher members where they are adjustably connected to the tension rod spring 43. the single, double or triple leaf type and formed with a centrally disposed substantially-V shaped contacting nose 44 which bears against a plate 45 of hardened material. With this particular arrangement the spring 45 then has, in effect, a

point bearing contact what is pivotal in character. a

With the aforementioned arrangement of the spring member 43, a constant retractingpull is exerted on both movable crusher members at all times yet if one of the crusher members becomes inoperative through rock-jam or the like, no shearing or breaking of parts takes place and the remaining crusher member continues to function without interruption.

Suitable auxiliary spring tension means may be provided as indicated at 46. Such spring tension means is adapted to retain the toggle levers in operative position with respect to their associated parts and at the same time to permit these levers The spring 43 may be of to perform their normal operating function as required.

The invention as disclosed may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present disclosure is therefore to be considered in all respect as illustrative rather than restrictive and all changes coming within the meaning and range of equivalency of the claims are intended to be embraced therein.

What I claim as my invention is:

1. In a device of the character described, a

frame, a stationary crusher member, movable crusher members operatively mounted adjacent the stationary crusher member, a fixed transverse bar member, toggle levers having pivotal engagement at their lower ends with the transverse bar member, spring tension means for exerting a retracting pull on the movable crusher members and toggle members interposed between the movable crusher members and the toggle levers, the said spring tension means comprising a stationary bearing, a leaf spring in pivotal engagement intermediate its ends with said bearing and rod members connecting the movable crusher members respectively with the ends of the spring.

2. In a device of thecharacter described, a frame, a stationary crusher member, movable crusher members mounted adjacent to and adapted to coact with the stationary crusher member, a fixed transverse bar member provided with a shim bearing having a concaved surface, toggle levers having hook-shaped lower ends terminating in a comparatively thin V-shaped bearing nose having pivotal contact bearing with the concaved surface of the transverse bar shim, the said concaved shim surface having an arc of greater radius than the arc of the nose of the toggle levers to permit up and down play of the nose of the toggle levers on the shim surface, operative means for operating the toggle levers and the crusher members alternately, spring tension means for exerting a retracting pull on the movable crusher members and spring means for exerting a retracting pull on the toggle levers.

3. In a device of the character described, a stationary crusher member, a movable crusher member operatively mounted adjacent to and for coaction with the stationary crusher member, a fixed transverse bar member disposed rearwardly of the, movable crusher member, a hard metal bearing shim detachably mounted on the fixed bar and provided with a concaved bearing surface, a toggle lever having its lower end formed with front and rear convex and concave faces respectively, eccentrically curving and tapering rearwardly atan acute angle relative to each other to provide a hook-shaped bearing end terminating in a comparatively thin V-shaped bearing nose and providing a clearance recessoverhanging the same, the nose of the toggle lever pivotally engaging the concaved surface of the bearing shim and being movable upwardly and downwardly upon the said concave surface of the shim, the said recess providing clearance for the operating movement of the toggle lever, a toggle member interposed between the toggle lever and the movable crusher member and spring means for exerting a retracting pull on the toggle lever.

' THOMAS SANDY. 

